4L80 acting weird AFTER adding wire for TCC

[myburb]

Re reading your post about tcc locking in 3rd, I don’t think I have seen any $OE that locks in 3rd. Years ago I did fool with using unused tow/haul numbers from $8D I think. I ended up just putting a auto/manual system in for when I wanted it locked when the pcm didn’t. Getting back to your problem it smells of flakey ground, something loose some place.

[CDeeZ]

Yeah, I just thought that wiring in the TCC must have screwed something up cause that's when my newest problem showed up that I've described lol. I now know that isn't the case cuz like I said I pulled the brake switch wire back out and ran it without the TCC and it's still doing it.

Well, I wonder what ground?? There are the two that go on the intake manifold and I checked them last night. I made bigass grounds out of battery cables that connect block,frame,body so I think it should be better grounded than the factory set it up... Unless there are other grounds to the PCM that I don't know about, I think those two that go on the intake are the only ones though?

I have been battling the overrich problem for a while trying to get a handle on the best approach and I have fouled plugs twice before. I pulled the plugs out just now and they are pretty fouled again, sooty black on the insulator nose of each plug, some worse than others. I'm going to tape the threads of the plugs and throw them in the blast cabinet and clean them up and put them back in, had good luck with that previously. If I barely touch the gas when accelerating it seems to not be an issue as much, less demand on the already fouled plugs perhaps?

[myburb]

Regarding rich, any chance your reported water temp is not going above your cold enrichment table and so always thinking it should have the (choke) on.

[CDeeZ]

I think I have made some progress on the rich issue. After fiddling around with the injector flow rate what seemed to help the most was to take the VE cell that it idles in, and the surronding cells for I believe 12 in total and reduce them all by a value of 25.

The other strange issue is still present. I'm still suspecting something with the 4L80. You mentioned a possible ground issue, wouldn't that show up in the scanner on the monitors as some form of a voltage drop, even for a split second? Voltage is rock steady. Tonight, for the second time the PCM set error code 73 Pressure Control Solenoid. Maybe this is the problem???? To describe the issue again, it feels like the trans drops in and out of gear, or hunts between gears when it is happening. I think I've even seen the scanner show it flip between 3rd and 4th when this is happening.....


EDIT: I can look at older logs and there is SOMETHING displayed on the monitors for the force motor duty cycle.... The log from tonight and the other night when this issue started, NOTHING for force motor duty cycle.

[CDeeZ]

The first image is what I would expect the force motor to look like on the logs. (The teal line) This is from a previous log before this issue happened.

The second image is of the force motor completely spiking down to zero on the monitors, perhaps a sign it's failing? This log is from a few days ago.

THe last image is showing the force motor duty cycle staying at 0... Doesn't even show up on the monitor now since it's 0. This log is from tonight.

[Terminal_Crazy]

Hi
[QUOTE]
The second image is of the force motor completely spiking down to zero on the monitors, perhaps a sign it's failing? This log is from a few days ago.[\QUOTE]

I don,t know and could be wrong but i suspect the log is showing the “commanded” output from the pcm rather than the actual output of the motor. Ie the log is showing pcm output rather than input data.

Mitch

[CDeeZ]

I think you may be right. I read somewhere that the PCM will shut the force motor off defaulting to max line pressure.

Where does the 4L80 ground??? Or is it the solenoids grounding as provided by the PCM for each shift event?